Finally, Apple has updated macOS to support Dolby Atmos Passthrough. This is NOT like the LPCM conversion retaining Dolby Atmos Metadata(Dolby MAT2.0) over on the Apple TV 4K. The lossy Atmos/DD+ signal from the Apple Music app and the Apple TV app in macOS Sequoia is sent out over HDMI in a bitstream. I'll experiment with other apps soon.